1. Naruto can't use the Death God seal. Minato stated that only a non-Jinchuuriki is able to use that technique, for whatever reason.
2. It's physically impossible for one person to seal even an entire Bijuu, much less all of them at once. That's why Minato was only able to seal one aspect of the Kyuubi (It's Yin half), not the entire thing.
Maybe if Naruto were the Jyubi Jinchuuriki, like the Rikudou Sannin, he could seal the entire Jyubi (using its own chakra), but that would assume he finds a way to use the technique as a Jinchuuriki.